How to Stop Working of up/down key for DropDownList

Just check the key pressed event for dropdownlist for example given below:

protected override void OnPreviewKeyDown(KeyEventArgs e)
            {
                if (IsReadOnly)
                {
                    if (e.Key == Key.Down || e.Key == Key.Up)
                    {
                        e.Handled = true;
                        return; // do not call the base class method OnPreviewKeyDown()
                    }
                }

                base.OnPreviewKeyDown(e);
            }

Quote:

That's right but i want to create one shortcut key Ctrl + Up Arrow for another control but it's not work and it's only get as a up Arrow key and change the value of dropdownlist

you need to set form's KeyPreview property to true

this.KeyPreview = true;

by setting above property form will receive key events before the event is passed to the control that has focus.

Hi Jay,

It is default behaviour of dropdown to change the selected values with up / down arrow keys. But these could be skipped by using the below code

private void ComboBox1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Up || e.KeyCode == Keys.Down)
{
e.SuppressKeyPress = true;
}
}